Just a sketch of the solutions to 1-mark questions in the previous quiz.
Denote  as the greatest integer not greater than .
is negative is negative.
Also, as tends to 0-, tends to negative infinity.
Let , where is a non-negative integer and
Now, for tends to 0-, let where
Thus, when tends to 0-, the limit above does not exist.
Taking tends to infinity, yield
Put , yield
and so on.